MOVING FROM EGYPT TO USA and buying apple world travel kit, will it affect me laptop ?

Hi i bought my laptop from EGYPT and now i moved to USA.. so i had to buy the apple world travel kit.. and i changed the last part in the adapter from being 2 circle pin that is used in Egypt to the2 rectangular pin that should be used in USA.. will this affect my battery life or my adapter?.. since on my Egyptian one ( 2 circle pin) it says 2.5 A /250V but my new one (2 rectangular pin) says 2.5 A/ 125v Thanks